. Fresh-water biology. Freshwater biology. 63 (62) Genital pore in anterior two-thirds 64 64 (71) Testes ventral to the yolk glands. Rhabdites only in mesenchyma tracts Tribe Typhloplanini . 65 Protonephridia with two main branches which communicate with the exterior through a transverse branch which leads either to the mouth or to the genital atrium. With or without atrial copulatory organs. 65 (66) Anterior end of body a retractile proboscis. . Rhynchomesostoma. Only one species. . Rhynchomesostoma rostratum (MiiUer) 1773. Length 2 mm. European specimens reach a length of s mm. when extended
. Fresh-water biology. Freshwater biology. 63 (62) Genital pore in anterior two-thirds 64 64 (71) Testes ventral to the yolk glands. Rhabdites only in mesenchyma tracts Tribe Typhloplanini . 65 Protonephridia with two main branches which communicate with the exterior through a transverse branch which leads either to the mouth or to the genital atrium. With or without atrial copulatory organs. 65 (66) Anterior end of body a retractile proboscis. . Rhynchomesostoma. Only one species. . Rhynchomesostoma rostratum (MiiUer) 1773. Length 2 mm. European specimens reach a length of s mm. when extended. Very transparent. Body fluid rose or yellowish-red in color. Intestine contains B yellowish-red oil droplets. Ventral surface flat, dorsal convex. Anterior end of body like a telescopic tube. Pharynx small, lying somewhat before the middle of the body. Rochester, N. Y. Fig. 620. Rhynchomesostoma rostratum. {A) Proboscis partly extended. (S) Fully contracted. X 40. (After von Graff.). 66 (65) Anterior end of body without retractile proboscis 67 67 (70) Without atrial copulatory apparatus 68. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
